I make a reasonable amount of money off of Google AdSense (on this website). Not a fortune, but it's certainly very helpful. Now, payouts are in US dollars, converted to Euros. A large part of the market is also dollar-economy. So over the last few months, while I've had a modest increase in page views and dollar earnings, my earnings have, in real terms, stayed static.
This is an exchange rate graph of dollars against euro for the last 120 days. Depressing for anyone who makes money in the US. Nice, I suppose, for anyone who wishes to visit the US; New York's tourist board has actually run an advertising campaign here advising people to 'shop while the dollar drops'. Absolutely horrific for US visitors to Europe, no doubt, although it seems that the small proportion of Americans who are inclined to travel internationally are mostly in the economic class to be able to cope with a little currency devaluation.